Study on applicability of indoor electromagnetic wave propagation attenuation statistical models in mines
The design, planning, and optimization of mining communication systems, personnel and vehicle positioning, wireless video, and wireless sensing systems such as 5G, 5.5G, WiFi 6, WiFi 7, UWB, and ZigBee require analysis of electromagnetic wave propagation in mines. The statistical model of electromag...
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| Main Authors: | , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Industry and Mine Automation
2025-02-01
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| Series: | Gong-kuang zidonghua |
| Subjects: | |
| Online Access: | http://www.gkzdh.cn/article/doi/10.13272/j.issn.1671-251x.18234 |
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| Summary: | The design, planning, and optimization of mining communication systems, personnel and vehicle positioning, wireless video, and wireless sensing systems such as 5G, 5.5G, WiFi 6, WiFi 7, UWB, and ZigBee require analysis of electromagnetic wave propagation in mines. The statistical model of electromagnetic wave propagation attenuation is an effective method for predicting the attenuation of electromagnetic waves. The applicability of indoor electromagnetic wave propagation attenuation statistical models in mines is analyzed. ① Electromagnetic wave propagation in mines occurs over long distances in a confined and unique environment, which is different from the short-distance propagation in simple rectangular indoor environments on the ground. ② The surrounding walls of mine roadways are thick coal and rock which have strong abilities to absorb electromagnetic waves, and roadway support materials further block the penetration of electromagnetic waves. Therefore, electromagnetic wave attenuation through walls is typically not considered. In the indoor-to-indoor electromagnetic wave propagation attenuation statistical models, the COST-Multi-Wall model and Keenan-Motley model consider electromagnetic wave attenuation through walls, making them unsuitable for mines. ③ Both the base station and wireless terminal in mines are located within the roadways, representing electromagnetic wave propagation in a confined internal space. The outdoor-to-indoor electromagnetic wave propagation attenuation statistical model is applicable to scenarios where the base station is in an open outdoor space and the wireless terminal is in a confined indoor space, making it unsuitable for mines. Subsequently, this study analyzed the prediction errors of indoor electromagnetic wave propagation attenuation statistical models for different mine scenarios (e.g. auxiliary transportation roadways, excavation roadways, curved roadways, branch roadways, fully mechanized mining faces). When using the WINNER II model, 3GPP InH-Office model, ITU-R P.1238 model, and ITU-R M.2412 InH model in indoor electromagnetic wave propagation attenuation statistical models to predict electromagnetic wave propagation attenuation in mines, the overall mean errors were 9.3 dB, 8.2 dB, 9.9 dB, and 7.7 dB, respectively. Due to the significant prediction errors, these models are unsuitable for mines. Currently, no specific statistical model for mine electromagnetic wave propagation attenuation has been developed based on the unique environment of mines. Therefore, it is necessary to study and establish a statistical model for electromagnetic wave propagation attenuation in mines that is tailored to the confined space and special environment of mines to guide the design and layout of mine communication base stations, positioning sub-stations, and their antennas. |
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| ISSN: | 1671-251X |